Well I have $26 bucks and if the wheels aren't used that often, I guess that would be worth it (no real chances for flats). I also pump up my tires before any ride anyways, so it wouldn't be a big deal for me to fill up the tubes. Especially if it can make even a 2-6W difference.

I have Attack/Force on my wheels right now, and I assume they're one of the better tires to work in conjunction with latex tubes.